You are given a string word. A letter c is called special if it appears both in lowercase and uppercase in word, and every lowercase occurrence of c appears before the first uppercase occurrence of c.
Return the number of special letters in word.
Example 1:
Input: word = "aaAbcBC"
Output: 3
Explanation:
The special characters are 'a', 'b', and 'c'.
Example 2:
Input: word = "abc"
Output: 0
Explanation:
There are no special characters in word.
Example 3:
Input: word = "AbBCab"
Output: 0
Explanation:
There are no special characters in word.
Constraints:
1 <= word.length <= 2 * 105word consists of only lowercase and uppercase English letters.Solutions for this problem are being prepared.
Try solving it yourself3121 & 3120 Count the Number of Special Characters II & Characters I • Aryan Mittal • 2,408 views views
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